diff options
Diffstat (limited to 'util.c')
| -rw-r--r-- | util.c | 90 |
1 files changed, 44 insertions, 46 deletions
@@ -15,6 +15,8 @@ #include <ctype.h> #include <stdio.h> #include <errno.h> +#include <math.h> +#include <float.h> #ifdef _WIN32 #include "missing/file.h" @@ -664,11 +666,9 @@ ruby_getcwd(void) * */ -#define TRUE 1 -#define FALSE 0 +#define MDMINEXPT DBL_MIN_EXP +#define MDMAXEXPT DBL_MAX_EXP -static int MDMINEXPT = -323; -static int MDMAXEXPT = 309; static double powersOf10[] = { /* Table giving binary powers of 10. Entry */ 10.0, /* is 10^2^i. Used to convert decimal */ 100.0, /* exponents into floating-point numbers. */ @@ -720,8 +720,8 @@ ruby_strtod( char **endPtr) /* If non-NULL, store terminating character's * address here. */ { - int sign, expSign = FALSE; - double fraction, dblExp, *d; + int sign, expSign = Qfalse; + double fraction = 0.0, dblExp, *d; register const char *p; register int c; int exp = 0; /* Exponent read from "EX" field. */ @@ -735,8 +735,8 @@ ruby_strtod( * case, fracExp is incremented one for each * dropped digit. */ int mantSize = 0; /* Number of digits in mantissa. */ - int hasPoint = FALSE; /* Decimal point exists. */ - int hasDigit = FALSE; /* I or F exists. */ + int hasPoint = Qfalse; /* Decimal point exists. */ + int hasDigit = Qfalse; /* I or F exists. */ const char *pMant; /* Temporarily holds location of mantissa * in string. */ const char *pExp; /* Temporarily holds location of exponent @@ -748,44 +748,43 @@ ruby_strtod( errno = 0; p = string; - while (ISSPACE(*p)) { - p += 1; - } + while (ISSPACE(*p)) p++; if (*p == '-') { - sign = TRUE; - p += 1; + sign = Qtrue; + p++; } else { - if (*p == '+') { - p += 1; - } - sign = FALSE; + if (*p == '+') p++; + sign = Qfalse; } + fraction = 0.; + exp = 0; + /* * Count the number of digits in the mantissa * and also locate the decimal point. */ - for ( ; c = *p; p += 1) { + for ( ; c = *p; p++) { if (!ISDIGIT(c)) { if (c != '.' || hasPoint) { break; } - hasPoint = TRUE; + hasPoint = Qtrue; } else { if (hasPoint) { /* already in fractional part */ - fracExp -= 1; + fracExp--; } if (mantSize) { /* already in mantissa */ - mantSize += 1; + mantSize++; } else if (c != '0') { /* have entered mantissa */ - mantSize += 1; + mantSize++; pMant = p; } - hasDigit = TRUE; + hasDigit = Qtrue; } } @@ -796,7 +795,7 @@ ruby_strtod( * they can't affect the value anyway. */ - pExp = p; + pExp = p; if (mantSize) { p = pMant; } @@ -809,7 +808,7 @@ ruby_strtod( p = string; } else { - int frac1, frac2; + double frac1, frac2; frac1 = 0; for ( ; mantSize > 9; mantSize -= 1) { c = *p; @@ -837,21 +836,20 @@ ruby_strtod( p = pExp; if ((*p == 'E') || (*p == 'e')) { - p += 1; + p++; if (*p == '-') { - expSign = TRUE; - p += 1; + expSign = Qtrue; + p++; } else { if (*p == '+') { - p += 1; + p++; } - expSign = FALSE; + expSign = Qfalse; } if (ISDIGIT(*p)) { do { - exp = exp * 10 + (*p - '0'); - p += 1; + exp = exp * 10 + (*p++ - '0'); } while (ISDIGIT(*p)); } @@ -873,22 +871,22 @@ ruby_strtod( * fraction. */ - if (exp >= MDMAXEXPT - 18) { - exp = MDMAXEXPT; + if (exp >= MDMAXEXPT) { errno = ERANGE; + return HUGE_VAL * (sign ? -1.0 : 1.0); } - else if (exp < MDMINEXPT + 18) { - exp = MDMINEXPT; + else if (exp < MDMINEXPT) { errno = ERANGE; + return 0.0 * (sign ? -1.0 : 1.0); } fracExp = exp; exp += 9; if (exp < 0) { - expSign = TRUE; + expSign = Qtrue; exp = -exp; } else { - expSign = FALSE; + expSign = Qfalse; } dblExp = 1.0; for (d = powersOf10; exp != 0; exp >>= 1, d += 1) { @@ -897,18 +895,18 @@ ruby_strtod( } } if (expSign) { - fraction = frac1 / dblExp; + frac1 /= dblExp; } else { - fraction = frac1 * dblExp; + frac1 *= dblExp; } exp = fracExp; if (exp < 0) { - expSign = TRUE; + expSign = Qtrue; exp = -exp; } else { - expSign = FALSE; + expSign = Qfalse; } dblExp = 1.0; for (d = powersOf10; exp != 0; exp >>= 1, d += 1) { @@ -917,17 +915,17 @@ ruby_strtod( } } if (expSign) { - fraction += frac2 / dblExp; + frac2 /= dblExp; } else { - fraction += frac2 * dblExp; + frac2 *= dblExp; } + fraction = frac1 + frac2; } if (endPtr != NULL) { - *endPtr = (char *) p; + *endPtr = (char *)p; } - if (sign) { return -fraction; } |